SOLUTION: Matthew is 3 times as old as jenny. In 7 years, he will be twice as old as she will be then. How old is each now?

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Question 219634: Matthew is 3 times as old as jenny. In 7 years, he will be twice as old as she will be then. How old is each now?
Answer by checkley77(12844) About Me  (Show Source):
You can put this solution on YOUR website!
M=3x
J=x
In 7 years:
(3x+7)=2(x+7)
3x=7=2x+14
3x-2x=14-7
x=7 Jenny's age now.
3*7=21 Matthew's age now.
Proof:
3*7+7=2(7+7)
21+7=2*14
28=28